Locking mechanism for the doors of elevator shafts



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s. l.. MCKINNEY LOCKING MECHANISM FOR THE DOORS OF ELEVATOR SHAFTS Filed Feb. 2o, 1922 IN VEN TOR. .5. LME-MME?.

A TTORNEY.

Patented .lune 3, 1924.

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SAMUEL L. MCKINNEY, 0F PEORIA, ILLINOIS.

Application led February 20, 1922. Serial No. 538,123.Y

To all whom t may concern:

Be it known that I. SAMUEL L. MCKIN- NE-Y. a citizen of the United States. residing at Peoria, in the county of Peoria and State of Illinois, have invented new and useful Improvements in Locking Mechanism for the Doors of Elevator Shafts; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the artto which it appertains to vmake and use the same t This invention relates to safety attachments or safety locks Jfor passenger and freight elevators.`

ore particularly the invention has to do with an improvementy in means for locking the elevator shaft door and the power-control operating-parts in the cage or car.

The'object of my invention is to combine with the door-locking mechanism shown and described in my prior Patent No. 1,144,965

dated June 29, 1915, certain parts for lock-l ing such mechanism when the door has been either all but closed, or entirely closed, so that said door cannot be opened even though the cage or car may bein position at a Hoor or landing ile my present invention is not required in general` yet its installation at times is necessary in order to comply with the laws of certain states governing the construction of elevator safety devices.

In the appended drawing- Figure 1 is an elevation of part of an elevator-shaft door, and car together with the devicer of my invention included with the structure of my former patent referred to. the whole being mounted upon the building floor shown in section.

Ylwigure 2 is an elevation of parts illustrated in Figure 1, certain of the parts be-` ing shownin a ditl'erentposition, and

Figure 3 shows'the same structure as Figure 2, in part, certain portions being broken away in order to better show the relation of the operating elements.

The building Hoor is designated'at 1, the floor-door at 2 and its guide track at`3, while 4 is part of the lelevator car as seen by an observer standing upon the licor outside said car. v

Following is a brief description of. the mechanism corresponding substantially to what is shown in my patent referred to, beA ing described herein merely in order to better show the `relation of my present new structure thereto.

5 is a case mounted upon the `floor 1 between the door 2 and the elevator-shaft, pivoted within which is a forked lever 6 which receives a roller 7 on the said door. The end of the Afork within the ease includes a toothed sector portion 8 with which, at times, a weighted pawl 9 engages, the latter being supported pivoted within the f case. 9 is a coil spring attached at one end to the pawl and at its other end to the case at such a point as to move the said pawl toward the teeth of the sector 8.'

Erected upon the floor 1, also, is a standard 10 supporting. slidably. a bar 11 operatively connected to the fork 6 by a-rod v12 pivoted at its ends to each.

13 is a block secured upon the bar 11 and provided with a roller 14.

VThe standard 10 also carries a bar 15 slidable therein. a rod 16 connecting it with the pawl 9. Said bar also carries a block 17 provided with a roller 18. v

Secured upon the outer surface of the wall of the car 4 is a of a hollow square, the two vertical legs. thereof slidably carrying a pair of spaced rods 20. Secure upon these, and having a vertical position, is a shoe 21, coil springs 22 on the rods 20 being compressed between the shoe and one of the said legs of the said bracket 19 tending at all times to move the shoe to the left as viewed in the figure.

A bell crank lever 23 is pivoted on the car-wall one arm having operativeV connection with the shoe by means of a rod 24. Attached to the other arm is a rod 25 which extends through the wall of the car and carries a toothed rack 26 engaging a pinion 27 on a horizontal rock-shat 28 of which a notched locking bar 29 is a part. adapted to becarried into the path Vof a starting lever 3() pivoted at 31 on the car due to the roller 7 swinging the forked lever 6 which causes the roller 14 to engage and move the said shoe 21. The lower end of the lever has a roller 32 adapted to depress a T-member 33 slidably vertically in a spring-case 34 secured on the wall of said car.

Slidable in the described bracket 19 is a pair of rods 35 which carry a shoe 36. A pin 37 is secured in the shoe 36 and extends through a slot (not shown) Yin the car-wall,v a rod 38 connecting the pin with one arm of a bell-crank lever 39. The other' arm of the' bracket 19, in the form i lever is attached to an extension o the T- member 33.

Involved in my present invention is a trigger A pivoted betwen its ends in the case 5. It has a. weight B at one end and maintains a substantially upright position thereby, when hanging free, as shown in Figures 1 and 2, lying against or in close proximity to the pawl 9.

The upper end of the trigger is provided with an upper surface C which.I for convenience, is described substantially from the point of pivotal support.

Pivotally hung from the fork 6 is a dog D which, inthe swinging of said fork, may drag over the surface C and the upper edge of the case 5.

The said upper edge of the case is preferably formed with steps or teeth E which form abutments for said dog as will be eX- plained presently, it being observed that an abutment is also created in connection with the trigger. The said trigger is stepped down from the said upper edge of the case, the latter forming, in the present instance, a third tooth with said trigger.

In Figure 1 the door 2 is in its closed position or that covering the hatchway (not shown) and by reason of the fact that the car 4 is now shown opposite the landing7 the shoe 36 which travels with the car has engaged the roller 18 of the bar thereby Shifting the latter to, the right to remove the paWl 9 lfrom the path of the sector 8. Therefore, the door would be free to open under ordinary conditions.

As shown in the figure named, however. the door has been opened and again closed but cannot again be opened without special manipulation of the starting lever 30. That is to say, when the car arrived at the landing the dog D had the position shown either in Figure 3, or in dotted lines at the eXtreme lett in Figure 2, the door being ree to be opened, carrying the fork 6 to the position shown in Figure 2, the dog dragging over the teeth E in its travel. Upon now closing the door, the ork returning to its position shown in Figure 1, drags the dog over the said teeth E and the trigger until said fork having come to rest against aV stop X, the said dog is left with its point resting upon the said trigger as shown in the igure last named.

An attempt to again open the door under this condition will be thwarted since the dog would strike the casing-edge just above the trigger,forming a lock, preventing the fork being moved, except at the desire ot the operator, however, who by slightlymoving the starting lever 30 may permit the T-member 33 to partially rise which it` does due to a controllingspring (not shown) within the spring-'case 34. This swings the bell-crank= lever and moves the shoe 36 away from the roller 18 sufficiently to let the bar 15 slide toward the case 5 under the tension of the spring 9 which spring causes the pawl 9 to engage and move the trigger from beneath the dog 'letting that member drop to hang freely whereupon the door can be opened.

In opening the door 2 the locking-bar 29 is moved to engage the lever 30 which bar,

though preventing the lever being moved so far as to start the car, permits a movement sufficient to cause the operation just described.

Wl hen the car leaves the iioor the' pawl 9 naturally moves into the path of the sector 8, Figure 3, the dog then being released because of said pawl, since the ofice of said dog is that only ot preventing the door being opened a second time, While the car is opposite the landing.

The several teeth E of the casing 5 are provided so that in the event that the door is not entirely closed the dog will engage any one ot them and still prevent said door being opened to the entrance of a passenger. But to again open the door it is first required to itully close the door and release the dog by the movement of the starting lever 30 as before.

The Whole purpose of the invention as already intimated, is that of preventing the door being opened a second time' While the car is at the landing, for, having both discharged and taken on passengers at a single opening movement of the door the door must be prevented from again being opened from outside, or inside the car except at the will of the operator.

I claim:

1. In ymechanism of the nature described, in combination, a door, a support, a' dooroperated lever mounted on said support, one of the two last named elements having an abutment thereon, the other having a dog pivoted thereon to engage the abutment, a movable trigger for supporting the dog in position to meet the abutment and prevent movement of the lever, and manually operated means for operating the trigger to release the dog.

2. In mechanism of the nature described, in combination, a. door, a support, a. dooroperated lever mounted on the support, one of the two last named elements having an abutment thereon, the other carrying a dog pivoted having normally depending a free end, a trigger arranged to support the free end of the dog and hold it in position to engage the said abutment in an attempted movement to open the door for preventing movement of said door, an elevator-car, a manually operated device therein, and means operatively engaging the same for moving the trigger to release the dog.

3. In mechanism of the nature described, l.in combination with a lever adapted to be engaged and swung by a door, a dog carried by the lever, an abutment in the path of the dog, a trigger at said abutment also in the path of and adapted to support said dog, and manually operated means to remove said trigger from the said path of the dog.

4. In mechanism for locking the door of an elevator-shaft, the combination with the shaft-door, a lever mounted on the building floor adapted to be swung by said door, and an elevator-car having a. manually controlled device therein` of a dog pivotally carried on the lever, said dog having a depending free end, an abutment in the path of the dog, a trigger adapted to support the said free end of the dog causing it to meet the abutment and prevent the movement of the lever, a movement of the manually controlled device in the elevator-car adapted to shift lthe trigger to release the dog.

5. In mechanism for locking the door of an elevator-shaft, the combination with the door, a lever mounted on the landing at said shaft adapted to be swung by said door, an elevator-car, and a manually controlled device therein, of a dog pivotally mounted on the said lever, adapted to hang freely from its point of support, a support for the lever including an abutment lying in the path of the dog, a trigger also lying in said path of the dog adapted in its normal position to support in raised position the free end of the dog causing the same to meet the abutment preventing the movement of the lever, and means operated by the said manually controlled device adapted to cause the withdrawal of the trigger to release the dog.

6. In mechanism of the character named, the combination with an elevator-car, its operating lever, and a shaft door, of a support mounted on the landing including a.l

serrated portion, a. lever pivoted in the support operated by the door, a dog pivoted on the lever having a free end adapted to drag over said serrations and also to engage the same, said dog adapted in one of its positions to hang freely suspended, and a trigger adapted to be placed in the path of the dog for holding its free end in position to engage one of the serrations for preventing movement of the lever to which it is pivoted, and means controlled by the lever in the elevator-car for changing the position of the trigger with respect to the dog.

7. In mechanism of the character described, the combination with an elevatorcar, its starting device, and a shaft-door, of a support mounted on the landing-floor, a lever pivoted on the support operated by the door in its opening and closing movements, a dog pivoted on the lever no-rmally free to swing in both directions, said support having a series of teeth lying in the path of movement of the dog adapted to support the same at times, said dog in one of its positions adapted to hang free of the teeth, a trigger pivoted on the support adapted to be pla-ced in line with the teeth to receive the free end of the dog upon it during the closing movement of the door whereby said trigger directs the dog against the said support in a direction to prevent the door being moved in the direction of its open position, and mechanism operated by the said starting device inthe car for moving the trigger to release the dog for permitting the door to be opened.

In testimony whereof I aiX my signature in presence of a Witness.

SAMUEL L. MGKINNEY.

Witness J. H. KINGSBURY. 

